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| author | Robert Hodaszi <[email protected]> | 2023-06-09 14:13:34 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2023-06-13 12:31:45 +0200 |
| commit | a82c3df955f8c1c726e4976527aa6ae924a67dd9 (patch) | |
| tree | a7254e8116c43fd37fb73966e440e4fe731a2d8b /lib/mpi/mpi-sub-ui.c | |
| parent | 306320034e8fbe7ee1cc4f5269c55658b4612048 (diff) | |
tty: serial: fsl_lpuart: reduce RX watermark to 0 on LS1028A
LS1028A is using DMA with LPUART. Having RX watermark set to 1, means
DMA transactions are started only after receiving the second character.
On other platforms with newer LPUART IP, Receiver Idle Empty function
initiates the DMA request after the receiver is idling for 4 characters.
But this feature is missing on LS1028A, which is causing a 1-character
delay in the RX direction on this platform.
Set RX watermark to 0 to initiate RX DMA after each character.
Link: https://lore.kernel.org/linux-serial/[email protected]/
Fixes: 9ad9df844754 ("tty: serial: fsl_lpuart: Fix the wrong RXWATER setting for rx dma case")
Cc: stable <[email protected]>
Signed-off-by: Robert Hodaszi <[email protected]>
Message-ID: <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Diffstat (limited to 'lib/mpi/mpi-sub-ui.c')
0 files changed, 0 insertions, 0 deletions